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Age-Based Demography and Reproductive Ontogeny of Angelfishes Belonging to the Family Pomacanthidae

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Age-Based Demography and Reproductive Ontogeny of Angelfishes Belonging to the Family Pomacanthidae ResearchOnline@JCU This file is part of the following reference: Sapolu, Tebaua (2005) Age-based demography and reproductive ontogeny of angelfishes belonging to the family Pomacanthidae. Masters (Research) thesis, James Cook University. Access to this file is available from: http://eprints.jcu.edu.au/1280/ The author has certified to JCU that they have made a reasonable effort to gain permission and acknowledge the owner of any third party copyright material included in this document. If you believe that this is not the case, please contact [email protected] and quote http://eprints.jcu.edu.au/1280 AGE-BASED DEMOGRAPHY AND REPRODUCTIVE ONTOGENY OF ANGELFISHES BELONGING TO THE FAMILY POMACANTHIDAE Thesis submitted by Tebaua Sapolu BSc Qld In July 2005 for the research degree of Master of Science in Marine Biology within the School of Marine Biology and Aquaculture at James Cook University STATEMENT OF ACCESS I, Tebaua Sapolu, the author of this thesis, understand that James Cook University will make this thesis available for use within University Library and, via the Australian Digital Theses network (unless granted an exemption), for use elsewhere. I understand that, as an unpublished work, a thesis has significant protection under the Copyright Act and; I do not wish to place any further restriction on access to this work. -------------------------------------- --------------------- ii STATEMENT ON SOURCES DECLARATION I declare that this thesis is my own work and has not been submitted in any form for another degree or diploma at any university or other institution of tertiary education. Information derived from the published or unpublished work of others has been acknowledged in the text and a list of references is given. ---------------------------------------- --------------------- iii Acknowledgements I wish to thank AUSAID in giving me an opportunity to undertake the masters degree at James Cook University, which has been an amazing experience. My greatest gratitude goes to my supervisor, Professor J. Howard Choat, for his consistent guidance and support throughout the whole project. This thesis wouldn’t have been possible without his encouragement during the difficult times of the degree. I also want to thank Phusit Horpet and Alison for their friendship, Elizabeth Laman Trip, John Ackerman, Stefan Walker for the valuable assistance in the growth analysis, and Phillip Munday for his guidance in gonad morphology. I wish to personally thank Adella Edwards for helping me with the contour maps and Gordon Bailey and Vincent Pulella for keeping my computer running. My warmest gratitude goes to my husband, Mark Sapolu and my baby Elijah Donall Sapolu, and my parents and family for their patience and support especially during the hardest part of this degree. And lastly my deepest thanks to Him who gave me the strength and wisdom to do something I never thought I could accomplish. iv General Abstract There is an urgent need to understand population dynamics and life history characteristics of reef fishes that are highly exploited and limited in distribution to facilitate effective management and make predictions of potential impact. This is important within the pomacanthids family in which no demographic studies has been done. This study aims to explore the demographic features and reproductive ontogeny of a group of pomacanthids species, Pomacanthus sexstriatus, Centropyge bicolor and C. loricul. P. sexstriatu and C. bicolor were collected from the Great Barrier Reef and C. loricul. two species are in the first two species and from Kiritimati, Kiribati in the Central Pacific. An age-based approach combined with gonad histology was used in this thesis to examine the growth and longevity, reproductive ontogeny and the mechanism underlying larger male size in the study species. v Table of Contents Statement of access .................................................................................. i Statement of sources - declaration ........................................................... ii Acknowledgement .................................................................................. iii General Abstract ..................................................................................... iv Table of Contents .....................................................................................v List of Figures and Tables ..................................................................... vii Chapter 1 General Introduction ..............................................................................1 Chapter 2 Review of the biogeography, life history and demography of Angelfishes (Pomacanthidae) with emphasis on endemics in the Pacific Ocean ....................................................................................5 2.1 Introduction ..............................................................................................5 2.2 The Structure of Pomacanthid Faunas .......................................................6 2.3 Biogeography of Pomacanthids ................................................................8 2.4 Pacific Endemic Pomacanthids in the Global Marine Aquarium Trade (GMAT) ....................................................................................... 13 2.5 Abundance and Distribution, Life History and Demography of Pomacanthidae ....................................................................................... 14 2.6 Conclusion ............................................................................................. 18 2.7 Predictions for Patterns in the Pacific Ocean ........................................... 18 2.8 Research needed on Endemic Pomacanthids in the Pacific ...................... 19 Chapter 3 Growth and Longevity in Three Angelfish Species ............................. 40 3.1 Introduction ............................................................................................ 40 3.2 Materials and Methods ........................................................................... 41 3.3 Results ................................................................................................... 46 3.4 Discussion .............................................................................................. 50 vi Chapter 4 Reproductive Ontogeny of Three Pomacanthid Species ..................... 54 4.1 Introduction ............................................................................................ 54 4.2 Materials and Methods ........................................................................... 58 4.3 Results ................................................................................................... 66 4.4 Discussion .............................................................................................. 73 Chapter 5 Otolith Dynamics of Pomacanthus Sexstriatus and Centropyge Bicolor ................................................................................................... 96 5.1 Introduction ............................................................................................ 96 5.2 Methods ................................................................................................. 98 5.3 Results ................................................................................................. 100 5.4 Discussion ............................................................................................ 104 Chapter 6 General Conclusions ........................................................................... 107 References .................................................................................................... 112 vii List of Figures and Tables Chapter 2 Table 2.1 Classification and regional distribution within the Pomacanthidae family............................................................................................. 20 Table 2.2 Pomacanthid species according to distribution types ....................... 21 Table 2.3 Number of pomacanthid species within distribution range categories according to genus (km.sq) ............................................ 22 Table 2.4 Definition of Endemism for the purpose of this review ................... 22 Table 2.5 Type a Endemism with respective geographic distribution and range ....................................................................................... 23 Table 2.6 Type b Endemic species with respective geographic distribution and range ....................................................................................... 24 Table 2.7 Type c Endemic species with respective geographic distributions and range ....................................................................................... 25 Table 2.8 Harvested endemic species belonging to the Pomacanthidae family............................................................................................. 26 Table 2.9 Spawning seasonality and lunar periodicity in pomacanthids .......... 27 Figure 2.1 Maximum size range of Pomacanthidae according to genera showing lower, upper and middle quartiles and outliers (o and *) ... 28 Figure 2.2 Box plot showing median depth ranges of pomacanthids according to genus, showing lower, upper and middle quartiles and outliers (o and *) ...................................................................... 28 Figure 2.3 Phylogenetic tree of 24 chosen species of Family Pomacathidae relative to the Family Chaetodontidae ............................................ 29 Figure 2.4 Species density contour map of the family Pomacanthidae.
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